Incommensurate spin density wave in Co-doped BaFe2As2

Abstract

57Fe Mossbauer spectroscopy measurements are presented in the underdoped Ba(Fe{1-x}Cox)2As2 series for x=0.014 (T_c < 1.4K) and x=0.03 and 0.045 (T_c ~ 2 and 12K respectively). The spectral shapes in the so-called spin-density wave (SDW) phase are interpreted in terms of incommensurate modulation of the magnetic structure, and allow the shape of the modulation to be determined. In undoped BaFe2As2, the magnetic structure is commensurate, and we find that incommensurability is present at the lowest doping level (x=0.014). As Co doping increases, the low temperature modulation progressively loses its "squaredness" and tends to a sine-wave. The same trend occurs for a given doping level, as temperature increases. We find that a magnetic hyperfine component persists far above the SDW transition, its intensity being progressively tranferred to a paramagnetic component on heating.

7 pages, 8 figures, published in EPL

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Cited by in corpus (24)

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• Competing order and nature of the pairing state in the iron pnictides
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• Shape of spin density wave versus temperature in AFe2As2 (A=Ca, Ba, Eu): A Mössbauer study
• Electronic phase separation: recent progress in the old problem
• Raman scattering study of Spin-Density-Wave order and electron-phonon coupling in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Local Magnetic Inhomogeneities in Lightly Doped BaFe${}_2$As${}_2$
• Electronic correlations in FeGa${}_3$ and the effect of hole doping on its magnetic properties
• Crossover from commensurate to incommensurate antiferromagnetism in stoichiometric NaFeAs revealed by single-crystal 23Na,75As-NMR experiments
• Electronic phase separation in iron pnictides
• Local and collective magnetism of EuFe${}_2$As${}_2$
• Commensurate antiferromagnetic ordering in Ba(Fe{1-x}Co{x})2As2 determined by x-ray resonant magnetic scattering at the Fe K-edge
• NMR study of nematic spin fluctuations in a detwinned single crystal of underdoped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Incommensurate spin-density wave and multiband superconductivity in Na${}_x$FeAs as revealed by nuclear magnetic resonance
• Magnetic moment evolution and spin freezing in doped BaFe${}_2$As${}_2$
• Coexistence of ferromagnetism, antiferromagnetism, and superconductivity in magnetically anisotropic (Eu,La)FeAs2
• Local Structure and Hyperfine Interactions of 57Fe in NaFeAs Studied by Mossbauer Spectroscopy
• Magnetically polarized Ir dopant atoms in superconducting Ba(Fe${}_{1-x}$Ir${}_x$)${}_2$As${}_2$
• 57Fe and 151Eu Mössbauer studies of 3d-4f spin interplay in EuFe(2-x)Ni(x)As2
• Study of the hyperfine fields in the BaFe${}_2$As${}_2$ family and its relation to the magnetic moment
• Crystal structure and magnetic modulation in beta-Ce2O2FeSe2
• Mössbauer studies of spin- and charge-modulations in BaFe2(As1-xPx)2
• Disorder correction to the Néel temperature of ruthenium-doped BaFe${}_2$As${}_2$: Theoretical analysis